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# aws-orgviz.ps1 ==============================================================
# Visualize AWS Organizations structure.
#
# Usage:
#   aws-orgviz.ps1 Show-Policies
#   aws-orgviz.ps1 Show-Accounts
#   aws-orgviz.ps1 Show-OUs
#   aws-orgviz.ps1 Show-OrgTree
#
param(
    [Parameter(Position = 0)]
    [ValidateSet("Show-Policies", "Show-Accounts", "Show-OUs", "Show-OrgTree")]
    [string]$Command
)

# Constants ===================================================================

$C = @{
    TopLeft  = [char]0x256D
    VLine    = [char]0x2502
    TBranch  = [char]0x251C
    LBranch  = [char]0x2570
    HLine    = [char]0x2500
    DirMark  = [char]0x25B8
    FileMark = [char]0x2022
}

$ROOT_ID = "r-yh7s"

# Helpers =====================================================================

function Write-Prefix {
    param([bool[]]$IsLastStack)
    foreach ($last in $IsLastStack) {
        if ($last) { Write-Host "   " -NoNewline }
        else { Write-Host "$($C.VLine)  " -NoNewline -ForegroundColor DarkGray }
    }
}

function Write-Branch {
    param([bool[]]$IsLastStack, [bool]$IsLast, [string]$Label, [string]$Sub)
    Write-Prefix -IsLastStack $IsLastStack
    $Branch = if ($IsLast) { "$($C.LBranch)$($C.HLine) " } else { "$($C.TBranch)$($C.HLine) " }
    Write-Host $Branch -NoNewline -ForegroundColor DarkGray
    Write-Host "$($C.DirMark) " -NoNewline
    Write-Host "$Label $Sub" -ForegroundColor Green
}

function Write-Leaf {
    param([bool[]]$IsLastStack, [bool]$IsLast, [string]$Label, [string]$Sub)
    Write-Prefix -IsLastStack $IsLastStack
    $Branch = if ($IsLast) { "$($C.LBranch)$($C.HLine) " } else { "$($C.TBranch)$($C.HLine) " }
    Write-Host $Branch -NoNewline -ForegroundColor DarkGray
    Write-Host "$($C.FileMark) " -NoNewline
    Write-Host "$Label $Sub"
}

# Data fetching ===============================================================

function Get-OUs {
    param([string]$ParentId)
    aws organizations list-organizational-units-for-parent --parent-id $ParentId |
    ConvertFrom-Json |
    Select-Object -ExpandProperty OrganizationalUnits
}

function Get-AccountsForParent {
    param([string]$ParentId)
    aws organizations list-accounts-for-parent --parent-id $ParentId |
    ConvertFrom-Json |
    Select-Object -ExpandProperty Accounts
}

function Build-OrgTree {
    param([string]$ParentId)
    $nodes = @()
    $ous = @(Get-OUs -ParentId $ParentId)
    $accts = @(Get-AccountsForParent -ParentId $ParentId)

    foreach ($ou in $ous) {
        $nodes += [PSCustomObject]@{
            Type     = "OU"
            Name     = $ou.Name
            Id       = $ou.Id
            Children = Build-OrgTree -ParentId $ou.Id
        }
    }
    foreach ($acct in $accts) {
        $nodes += [PSCustomObject]@{
            Type     = "Account"
            Name     = $acct.Name
            Id       = $acct.Id
            Children = @()
        }
    }
    return $nodes
}

# Tree rendering ==============================================================

function Render-Node {
    param([PSCustomObject]$Node, [bool[]]$IsLastStack, [bool]$IsLast)

    if ($Node.Type -eq "OU") {
        Write-Branch -IsLastStack $IsLastStack -IsLast $IsLast -Label $Node.Name -Sub "[$($Node.Id)]"
        $children = @($Node.Children)
        for ($i = 0; $i -lt $children.Count; $i++) {
            Render-Node -Node $children[$i] -IsLastStack ($IsLastStack + $IsLast) -IsLast ($i -eq ($children.Count - 1))
        }
    }
    else {
        Write-Leaf -IsLastStack $IsLastStack -IsLast $IsLast -Label $Node.Name -Sub "[$($Node.Id)]"
    }
}

# Commands ====================================================================

function Show-Policies {
    aws organizations list-policies --filter SERVICE_CONTROL_POLICY |
    ConvertFrom-Json |
    Select-Object -ExpandProperty Policies |
    Where-Object { -not $_.AwsManaged } |
    Format-List
}

function Show-Accounts {
    aws organizations list-accounts |
    ConvertFrom-Json |
    Select-Object -ExpandProperty Accounts |
    Format-List
}

function Show-OUs {
    $l1 = @(Get-OUs -ParentId $ROOT_ID)
    foreach ($ou in $l1) {
        $ou | Format-List
        $l2 = @(Get-OUs -ParentId $ou.Id)
        foreach ($child in $l2) {
            $child | Format-List
        }
    }
}

function Show-OrgTree {
    Write-Host "Fetching organization data..." -ForegroundColor DarkGray
    $tree = @(Build-OrgTree -ParentId $ROOT_ID)
    [Console]::SetCursorPosition(0, [Console]::CursorTop - 1)
    [Console]::Write(" " * [Console]::WindowWidth)
    [Console]::SetCursorPosition(0, [Console]::CursorTop)

    Write-Host "$($C.TopLeft)$($C.HLine) " -NoNewline -ForegroundColor DarkGray
    Write-Host "AWS Organization " -NoNewline -ForegroundColor Blue
    Write-Host "[$ROOT_ID]"
    Write-Host $C.VLine -ForegroundColor DarkGray

    for ($i = 0; $i -lt $tree.Count; $i++) {
        Render-Node -Node $tree[$i] -IsLastStack @() -IsLast ($i -eq ($tree.Count - 1))
    }
}

# Dispatch ====================================================================

if (-not $Command) {
    Write-Host "Usage: aws-orgviz.ps1 <command>" -ForegroundColor DarkGray
    Write-Host ""
    Write-Host "Available commands:"
    Write-Host "  Show-Policies   Prints a list of all policies"
    Write-Host "  Show-Accounts   Prints a list of all accounts"
    Write-Host "  Show-OUs        Prints a list of all organizational units"
    Write-Host "  Show-OrgTree    Prints a tree view of the organizational structure"
    Write-Host ""
    Write-Host "Example: aws-orgviz.ps1 Show-Policies"
    Write-Host ""
    return
}

switch ($Command) {
    "Show-Policies" { Show-Policies }
    "Show-Accounts" { Show-Accounts }
    "Show-OUs" { Show-OUs }
    "Show-OrgTree" { Show-OrgTree }
}